PUM stands for Potentially Unwanted Modification. In this case is is in regards to whether or not you want to allow toolbars to be able to be customized in explorer. This is not a malware infection, it is a restriction that is set on the computer, your GPO

Thanks Rob and Mike My boss wants to send our Malwarebytes logs to Trend Micro because he wants them to tell us why Office Scan never detects anything or if it does why it never able to clean the threat and we have to use Malware bytes to do it.

Me personally I think it's time to leave Trend in the dust and move on